* {
  margin: 0;
  padding: 0;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-image: linear-gradient(to top, #e6e9f0 0%, #eef1f5 100%);
}

/* 按钮样式 */
.button {
  display: inline-block;
  position: relative;
  z-index: 1;
  overflow: hidden;
  text-decoration: none;
  font-family: sans-serif;
  font-weight: 600;
  font-size: 2em;
  padding: 0.75em 1em;
  color: blue;
  border: 0.15em solid blue;
  border-radius: 2em;
  transition: 4s;
}

.button:before,
.button:after {
  content: "";
  position: absolute;
  top: -1.5em;
  z-index: -1;
  width: 200%;
  aspect-ratio: 1;
  border: none;
  border-radius: 40%;
  background-color: rgba(0, 0, 255, 0.25);
  transition: 4s;
}

.button:before {
  left: -80%;
  transform: translate3d(0, 5em, 0) rotate(-340deg);
}

.button:after {
  right: -80%;
  transform: translate3d(0, 5em, 0) rotate(390deg);
}

.button:hover,
.button:focus {
  color: white;
}

.button:hover:before,
.button:hover:after,
.button:focus:before,
.button:focus:after {
  transform: none;
  background-color: rgba(0, 0, 255, 0.75);
}